v1.01.359 ZZZZ359 — Validating the macro command POST_CZM_FISS/OPTION = “TRIAXIALITE”

Summary

This test validates the functionality available under the keyword OPTION = “TRIAXIALITE” of the macro command POST_CZM_FISS [U4.86.02]. In this case, the macro-command provides a map dimensioned to the number of cells carrying cohesive elements (joint or interface), containing the value of the triaxiality rate averaged in the elements of the mass directly connected to each of these cells. The objective is then to use this map as a control variable in the operator AFFE_MATERIAU (AFFE_VARC/CHAM_GD) [U4.43.03] in order to vary the parameters of the law cohesive with triaxiality.

This functionality is validated on a simple uniaxial traction problem, for which an analytical solution is available: it is a linear elastic bar under tension, at the center of which is arranged a discontinuity governed by a cohesive behavior. A zero Poisson’s ratio is chosen for this material in order to maintain a uniaxial state since the models of this test are carried out in dimensions 2 and 3. The two models in this test have the following characteristics:

• modeling A: 3D modeling for the massif, 3D modeling_ INTERFACE for the cohesive interface, the bar is fully modeled;

• B modeling: D_ PLAN modeling for the massif, PLAN_JOINT modeling for the cohesive interface, we only model half of the bar (symmetry condition).

• 1. Reference problem
  • 1.1. Geometry
  • 1.2. Material properties
  • 1.3. Boundary conditions and loads
• 2. Reference solution
  • 2.1. Calculation method
  • 2.2. Reference quantities and results
• 3. Principle of the test
• 4. Modeling A: interface elements in dimension 3
  • 4.1. Characteristics of modeling
  • 4.2. Characteristics of the mesh
  • 4.3. Tested sizes and results
• 5. Model B: joint elements in dimension 2
  • 5.1. Characteristics of modeling
  • 5.2. Characteristics of the mesh
  • 5.3. Tested sizes and results
• 6. Summaries of results